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Chapter 17 - Chapter 17 Downcutting the process of eroding...

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Chapter 17 Downcutting: the process of eroding or digging into substrate How does a stream channel form? 1. the velocity of the flow, faster flow erodes quicker 2. the strength of the substrate, weaker substrate erodes more rapidly 3. vegetation cover, unvegetated ground can be eroded rapidly Drainage Network: an array of interconnecting streams that together drain an area a. tributaries: smaller streams b. trunk steam: the single larger stream the tributaries flow into Different types of networks 1. dendritic: looks like a deciduous tree with branches connecting to a trunk 2. radial: drainage forming on the surface of a cone shaped mountain flow off the peak 3. rectangular: in places where a rectangular grid of fractures breaks up the ground, channels form and streams join at right angles 4. trellis: a single stream that cuts across ridges and places where the trunk stream are Watershed: a drainage basin, broad region that collects water Drainage Divide:
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